[xsl] undo a transformation

[Garvin Riensche <g.riensche@xxxxxxx>]

Hello,

I am wondering if anyone has dealt with rollbacks of xslt 
transformations yet. Maybe there are some resources on the web which 
deal with rollbacks because I am wondering what would be the best way to 
undo a transformation.

For example consider the following task: I have two stylesheets that are 
called one after another from a third one. If the second stylesheet 
doesn't match anything I want to undo the transformation of the the 
first one. This should be like an AND composition of two stylesheets.

What would be a good way to implement such a logic?

Regards,
Garvin